OWNER'S MANUAL COMMAND CH18-CH26, CH620-CH750 HORIZONTAL CRANKSHAFT
Safety Precautions To ensure safe operations please read the following statements and understand their meaning. Also refer to your equipment owner's manual for other important safety information. This manual contains safety precautions which are explained below. Please read carefully. WARNING Warning is used to indicate the presence of a hazard that can cause severe personal injury, death, or substantial property damage if the warning is ignored.
Safety Precautions (Cont.) WARNING WARNING Accidental Starts can cause severe injury or death. Carbon Monoxide can cause severe nausea, fainting or death. Disconnect and ground spark plug leads before servicing. Avoid inhaling exhaust fumes, and never run the engine in a closed building or confined area. Accidental Starts! Disabling engine. Accidental starting can cause severe injury or death.
Air Cleaner Dipstick Fuel Pump Oil Fill Oil Filter Fuel Filter Electric Starter Oil Drain Plug (Each Side) Rectifier-Regulator Figure 1. Typical Command Horizontal Shaft Carbureted Engine. Throttle Body Intake Manifold Ignition Coil Fuel Injectors Ignition Coil Oil Filter Oil Cooler Rectifier-Regulator Figure 2. Typical Command Horizontal Shaft EFI Engine.
Oil Recommendations Using the proper type and weight of oil in the crankcase is extremely important. So is checking oil daily and changing oil regularly. Failure to use the correct oil, or using dirty oil, causes premature engine wear and failure. Oil Type Use high quality detergent oil of API (American Petroleum Institute) service class SG, SH, SJ, or higher. Select the viscosity based on the air temperature at the time of operation as shown in the following table.
Engine Identification Numbers When ordering parts, or in any communication involving an engine, always give the Model, Specification, and Serial Numbers of the engine. The engine identification numbers appear on a decal affixed to the engine shrouding. Include letter suffixes, if there are any. Record your engine identification numbers on an identification label below (Figure 5) for future reference. For Models CH18-CH745 IMPORTANT ENGINE INFORMATION THIS ENGINE MEETS U.S.
• Check that any clutches or transmissions are disengaged or placed in neutral. This is especially important on equipment with hydrostatic drive. The shift lever must be exactly in neutral to prevent resistance which could keep the engine from starting. WARNING: Lethal Exhaust Gases! Engine exhaust gases contain poisonous carbon monoxide. Carbon monoxide is odorless, colorless, and can cause death if inhaled. Avoid inhaling exhaust fumes, and never run the engine in a closed building or confined area.
Stopping 1. Remove the load by disengaging all PTO driven attachments. 2. For Carbureted Engines Without A Shutdown Solenoid: Move the throttle to the slow or low idle position. Allow the engine to run at idle for 30-60 seconds; then stop the engine. For Carbureted Engines Equipped With A Shutdown Solenoid: Position the throttle control somewhere between half and full throttle; then stop the engine. For EFI Engines: Move the throttle to the slow or idle position; turn key off to stop engine.
Maintenance Schedule These required maintenance procedures should be performed at the frequency stated in the table. They should also be included as part of any seasonal tune-up. Frequency Daily or Before Starting Engine Every 25 Hours Every 100 Hours Every 200 Hours Maintenance Required • • • • • • • • • • • • Fill fuel tank. Check oil level. Check air cleaner for dirty1, loose, or damaged parts. Check air intake and cooling areas, clean as necessary1. Service precleaner element1.
Change Oil and Filter, Service Oil Cooler Change Oil Change oil after every 100 hours of operation (more frequently under severe conditions). Refill with service class SG, SH, SJ or higher oil as specified in the Viscosity Grades table (Figure 3) on page 5. Change the oil while the engine is still warm. The oil will flow more freely and carry away more impurities. Make sure the engine is level when filling, checking, and changing the oil. Change the oil as follows (see Figures 8 and 9): 1.
9. Start the engine and check for oil leaks. Correct any leaks before placing the engine into service. Check oil level to be sure it is up to but not over the “F” mark. Service Oil Cooler Some engines are equipped with an oil cooler. One style of oil cooler mounts on the engine crankcase and has the oil filter on it (See Figure 8). The other style of oil cooler is mounted on the blower housing (see Figure 9), separate from the oil filter.
Service Paper Element Every 100 hours of operation (more often under extremely dusty or dirty conditions) replace the paper element. 1. Loosen the cover retaining knob and remove the cover. 2. Pull the air cleaner element out of the housing. See Figure 12. Main Element Inner Element 2. Remove the element cover nut, element cover, and paper element with precleaner. 3. Remove the precleaner (if so equipped) from the paper element. Service the precleaner as described above. 4.
Clean Air Intake/Cooling Areas To ensure proper cooling, make sure the grass screen, cooling fins, and other external surfaces of the engine are kept clean at all times. Every 100 hours of operation (more often under extremely dusty, dirty conditions), remove the blower housing* and other cooling shrouds. Clean the cooling fins and external surfaces as necessary. Make sure the cooling shrouds are reinstalled. 3. Check the gap using a wire feeler gauge. Adjust the gap to 0.76 mm (0.030 in.
EFI Engines: A special, high volume, high pressure filter with greater filtration capabilities and internal surface area is used. See Figure 15. Fuel Filter Fuel Line Figure 15. EFI Fuel Filter and Line. Replacement is recommended every 1500 hours, or more frequently under extremely dusty or dirty conditions. When replacement is necessary, always use genuine Kohler parts.
• If the fuel tank is equipped with a shut-off valve, make sure it is open. • If the engine is equipped with an in-line fuel filter, make sure it is clean and unobstructed. Replace the filter if necessary. • Make sure fuel is reaching the carburetor. This includes checking the fuel lines and fuel pump for restrictions or faulty components, replace as necessary. • Make sure the air cleaner element is clean and all air cleaner element components are fastened securely.
adjusting needle in (clockwise). The engine speed may increase, then it will decrease as the needle is turned in (lean). Note the position of the needle. Set the adjusting needle midway between the rich and lean settings. See Figure 21. Model CH750 CH750 engines use a Keihin BK two-barrel carburetor with fixed main jets and fixed or limiter-equipped low idle fuel adjusting needles. See Figure 20. Adjustments are made as follows.
NOTE: The EFI system requires a rather complex wiring harness to carry the electrical signals between the sensors and the ECU. Do not spray water at the wiring harness or any of the electrical components, especially the ECU, as it could cause malfunction, damage, or failure.
Storage If the engine will be out of service for two months or more, use the following storage procedure: 1. Clean the exterior surfaces of the engine. On EFI engines, avoid spraying water at the wiring harness or any of the electrical components. 2. Change the oil and filter while the engine is still warm from operation. See Change Oil and Filter on page 10. 3. The fuel system must be completely emptied, or the gasoline must be treated with a stabilizer to prevent deterioration.
LIMITED 2 YEAR COMMAND ENGINE WARRANTY Kohler Co. warrants to the original consumer that each new COMMAND engine sold by Kohler Co. will be free from manufacturing defects in materials or workmanship in normal service for a period of two (2) years from date of purchase, provided it is operated and maintained in accordance with Kohler Co.’s instructions and manuals. Our obligation under this warranty is expressly limited, at our option, to the replacement or repair at Kohler Co.
(c) For warranty repairs, the engine must be presented to a Kohler Co. service center as soon as a problem exists. Call 1-800-544-2444 or access our website at: www.kohlerengines.com, for the names of the nearest service centers. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days. If you have any questions regarding warranty rights and responsibilities, you should contact Kohler Co. at 1-920-457-4441 and ask for an Engine Service representative.
